Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
luan phuong » lan phuong, quang phuong, doan phuong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tinh luan » trinh luan, binh luan, minh luan
nang cham » trang cham, nang cao, nang phat
ngan nhat » ngan nam, nam nhat, tran nhat
hoc hieu » hoc thieu, hoc hien, doc hieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh tinh luan phuong cong ((nang cham) or (ngan nhat)) ran~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh tinh luan phuong cong ((nang cham) OR (ngan nhat)) ran*.